Pretty much have to use bait in my opinion to really draw hits. Usually it's the bait that draws the hit and not the lure. The lure though may help attract fish to the bait. The only type of lure I have had consistant success on without using bait is a swimming lure like a jigging rapala. I once caught a 5 pound rainbow on a do jigger spoon once without any bait on it. But then again, that's a rainbow trout were talking about. A vicous, aggressive, slobbering fool predator. So always go with bait in my book.
Tyler